Page 1
Installation Instructions
FLEX Ex Power Supply
Catalog Number 1797-PS2E2
Top ic Page
Important User Information 2
About the Power Supply 3
Understand System Planning 4
Installation in Zone 1, 22 6
Electrostatic Charge 8
Outputs 8
Mount the 1797-PS2E2 Power Supply 8
Customer Connections 10
Typical Wiring Configurations 10
Mounting Dimensions and Terminal Base Assignments for the
1797-PS2E2 Power Supply
Repair 11
FLEX Ex Power Supply, cat. no. 1797-PS2E2 12
Ferrite Beads 15
11
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2 FLEX Ex Power Supply
WARNING
IMPORTANT
ATTENTION
SHOCK HAZARD
BURN HAZARD
Important User Information
Solid state equipment has operational characteristics differing from those of electromechanical
equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls
(Publication SGI-1.1 available from your local Rockwell Automation sales office or online at
http://literature.rockwellautomation.com) describes some important differences between solid state
equipment and hard-wired electromechanical devices. Because of this difference, and also because of the
wide variety of uses for solid state equipment, all persons responsible for applying this equipment must
satisfy themselves that each intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the
many variables and requirements associated with any particular installation, Rockwell Automation, Inc.
cannot assume responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits,
equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell
Automation, Inc., is prohibited.
Throughout this manual we use notes to make you aware of safety considerations.
Identifies information about practices or circumstances that can cause an explosion in a
hazardous environment, which may lead to personal injury or death, property damage, or
economic loss.
Identifies information that is critical for successful application and understanding of the
product.
Identifies information about practices or circumstances that can lead to personal injury or
death, property damage, or economic loss. Attentions help you identify a hazard, avoid a
hazard, and recognize the consequence
Labels may be on or inside the equipment to alert people that dangerous voltage may be
present.
Publication
Labels may be on or inside the equipment to alert people that surfaces may be dangerous
temperatures.
1797-5.8 - June 2010
Page 3
ATTENTION
This equipment is considered Group 1, Class A industrial equipment
1797-PS2E2
30686
according to IEC/CISPR Publication 11. Without appropriate
precautions, there may be potential difficulties ensuring
electromagnetic compatibility in other environments due to
conducted as well as radiated disturbance.
This equipment is supplied as enclosed equipment. It should not
require additional system enclosure when used in locations
consistent with the enclosure type ratings stated in the
Specifications section of this publication. Subsequent sections of
this publication may contain additional information regarding
specific enclosure type ratings, beyond what this product provides,
that are required to comply with certain product safety certifications.
About the Power Supply
FLEX Ex Power Supply 3
The power supply is an essential component in the operation of an
intrinsically safe system. It must isolate the unsafe incoming power from the
control system and limit the available energy to IS-safe levels.
No other power sources are needed to operate any components attached to
the FLEX Ex system in the hazardous area. Power for valves, actuators, or
transmitters come from the FLEX Ex modules.
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4 FLEX Ex Power Supply
The 1797-PS2E2 is a 24V dc in/quad-Ex dc out power supply in an
flame-proof enclosure with increased safety input and output terminations.
The 24V dc gland is an M20 x 1,5 and can accept a cable from 6…12
mm
(0.267…0.472 in.) in diameter. The Ex outputs are M16 x 1,5 and can accept a
cable from 4…8 mm (0.157…0.315 in.) in diameter.
Features include the following:
24V dc supply source
Four channels, 8.5 W output each channel
Dual power feeds for source input redundancy
Outputs are IS galvanically isolated from the source
All channels are independently IS limited
Understand System Planning
Part of system planning is determining what modules are needed for the
application, how many power supplies are needed, how to best partition the
system, and where to locate the system cabinets.
A key task in the development cycle is determining the number of power
supply outputs (thus power supplies) you will need. In the following example,
you will need 11 power outputs if you are using the fiber hub, which requires
8.5 W.
Modules Requires Modules Requires
Fiber hub 8.5 W Two thermocouple inputs 1.6 W each
Two ControlNet adapters
Two analog inputs 7.5 W each Three NAMUR digital inputs 2.8 W each
Two analog outputs 6.3 W each Two counter inputs 4.25 W each
8.5 W each Two digital outputs 7.5 W each
Each power supply has four independent IS-power outputs capable of 8.5 W
each. In the above example, we required 11 IS-power outputs so 3 power
supplies were sufficient.
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IMPORTANT
IS Pwr
Safe Area
Hazardous Area
1797 power supply
1797 power supply
1797 power supply
ACNR
Spare
IE8 OE8 IRT8 Spare Spare IJ2 IJ2
ACNR OB4 OB4D IBN16 IBN16 IBN16 IE8 IRT8 OE8
RPA RPFM RPFM
IS 1797 I/O
IS 1797 I/O
IS 1797 Fiber Hub
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
Ex d/e
Ex ib
Ex d/e
Ex ib
Ex d/e
Ex ib
41306
Unsafe
Power
Entrance
Spare
Unsafe
Power
Entrance
Unsafe
Power
Entrance
FLEX Ex Power Supply 5
The total number of power supplies needed depends on the modules used
and the total system configuration. The following illustration shows how this
example may be configured.
Even though modules may be supplied with power from the same
power-supply output channel, galvanic isolation in the module
provides module-to-module galvanic isolation. Depending upon
the module-type, galvanic isolation (channel-to-channel within the
module) may or may not be provided. See the module’s
specifications for more information.
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6 FLEX Ex Power Supply
WARNING
41307
Make certain that you only connect intrinsically-safe power supplies to other
intrinsically-safe system modules or adapters to maintain the integrity of the
intrinsically-safe backplane.
Installation in Zone 1, 22
The 1797-PS2E2 power supply has a protection factor of IP65. Refer to the
specifications table for the IS module type.
The power supply cannot be used in an intrinsically safe environment
after its outputs have been exposed to nonintrinsically safe signals.
Application
When installing, commissioning, operating, and maintaining devices or device
components of the FLEX Ex system as intrinsically-safe electrical apparatus
in potentially explosive atmospheres according to EN 60079-11, you must
heed the EC- type examination certificate and the applicable national and
local construction, installation, and operating regulations.
Zone 1
The power supply can be located in Zone 1. The permissible ambient
temperature of -20…70 °C must not be exceeded.
Zone 22
The housing type of the power supply is applicable for use in Zone 22. It
corresponds with the category 3D acc. to directive 94/9 EC and is marked
with a type label accordingly.
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FLEX Ex Power Supply 7
Installation and Commissioning
The power supply unit can be located in Zones 1, 2, and 22 as stated on its
label. The output circuits are according to the ignition protection class Ex ib
and can be installed in Zones 1, 2, and 22. When installing, you must heed the
EC- type examination certificate (especially the special conditions) and the
applicable national and local construction, installation, and operating
regulations.
The housing (Ex d) must not be opened (screw cover). Connections are made
in the (Ex e) terminal box.
Install the power feed lines only in the deenergized state. Also follow the
information on the type label, respectively the covers of the terminals.
You can connect and disconnect the intrinsically-safe output terminals during
operation.
All unused cable glands must be covered by appropriate prototype tested Ex e
lead seals to keep the requirement of IP54.
The cover installed on the nonintrinsically-safe screw terminals
(IP30) may be removed only in the deenergized state and must be remounted
after working on these terminals.
Before closing the cover of the (Ex e) wiring box, inspect the seal for any
signs of damage. In case of damage, the seal must be replaced by a new seal
that is identical to the damaged seal.
The power supply housing contains two flanges, which can be connected to a
wall or other structural part by means of fixing screws. Select fixing screws
that ensure secure fixing of the power supply. Consider the condition of
vibration of the power supply when making this selection.
On the (Ex d) housing there is an earthing screw. This screw must be
connected to Earth with a conductor having a minimum of 4 mm² (0.006 in.
area. The connection has to be protected against self-opening and corrosion.
Corrosion protection can be achieved by using tinned terminal ends.
Before opening the (Ex e) terminal box (for example, for maintenance
purposes), it must be cleaned of all dust particles to ensure that no dust can
enter the box.
2
)
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8 FLEX Ex Power Supply
IMPORTANT
ATTENTION
Electrostatic Charge
Protect the system against electrostatic charge. Post a sign near this module.
WARNING Avoid electrostatic charging.
ADVERTÊNCIA! PREVENIR CONTRA O ACÚMULO DE CARGA
ELETROSTÁTICA.
For your convenience, a sign that can be cut out and posted is included on the
last page of these installation instructions.
Outputs
When using an intrinsically-safe electrical apparatus according to EN
60079-11, the European directives and regulations must be followed.
The channels in the power supply are electrically connected to each other and
have a common +V line.
You cannot interconnect lines because of the intrinsic safety
requirements.
Mount the 1797-PS2E2 Power Supply
Follow these directions to properly install the 1797-PS2E2 power supply.
Refer to the Installation and Commissioning section, page
precautions and considerations.
7, for important
Use star washers and nuts to make sure you have a good electrical
connection. Scrape the paint off the back panel in those areas where
grounding bolts will be located.
1. Remove the screws on the cover of the power supply Ex e terminal
box to access the input and output terminals.
2. Thread the blue IS-safe output power wiring through the blue IS
compression seals.
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FLEX Ex Power Supply 9
ATTENTION
3. Connect the blue IS-safe output power wiring to the output terminals
making sure all connections are tight.
These power supply outputs provide the input power to the FLEX Ex
modules.
4. Thread the hazardous incoming-power wiring through the black
compression seals.
5. Connect the hazardous incoming-power wiring to the input terminals
making sure all connections are tight.
You can daisy-chain the hazardous incoming-power wiring to further
supplies to simplify system wiring.
Keep hazardous and IS-safe wiring separated in a suitable
fashion. Do not leave long, excess wiring that could bridge
between the hazardous and safe areas.
6. Replace the lid of the Ex e terminal box.
7. Screw the lid back into place making sure all of the screws are tight.
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10 FLEX Ex Power Supply
Vin1
Vin2
Chassis GND
IS Isolation
Hazardous to IS
-V
+V
Out 1
-V
+V
Out 2
-V
+V
Out 3
41315
Dual Input
Diodes
IS Limiters
Voltage and Current
-V
+V
Out 4
+
+
-
dc
Type of Power Input
IS Power Output
Daisy-chaining
+V, -V
You can use the daisy chain configuration if the
total module power draw is < 8.5 W. Otherwise,
power is connected to individual modules.
Combination
Wiring when total module current
power is greater than 8.5 W.
<8.5 W
+V, -V
Other variations are possible depending
upon individual module power.
<8.5 W+V, -V
1797-PS2E2
Hazardous
Incoming
Power
IS-safe
Output Power
Keep Wires Separate
41316
Customer Connections
Typical Wiring Configurations
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FLEX Ex Power Supply 11
41298A
mm (in.)
218 (8.58)
174 (6.85)
174
(6.85)
280
(11)
Mounting Dimensions
149
(5.87)
10 (0.39) 2 Holes
Chassis Ground
194 (7.64)
Height
140 (5.51)
42489
10 11 12 13 14 15 16 17
1245
Chassis GND
-+
Vin1-+Vin2
+V -V +V -V +V -V +V -V
Out 1 Out 2 Out 3 Out 4
Terminal Base Assignments
European DC Power Input IS Power Output
Mounting Dimensions and Terminal Base Assignments for the 1797-PS2E2 Power Supply
Repair
The power supply is not field-repairable. Any attempt to open this module
will void the warranty and IS certification. If repair is necessary, return this
module to the factory.
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12 FLEX Ex Power Supply
Specifications
Table 1 FLEX Ex Power Supply, cat. no. 1797-PS2E2
Attribute Value
Zone 1 II 2G Ex de [ib] IIC T4 (DMT 02 ATEX E253 X)
Zone 22 II 3D IP54 T90C
Input connectors 24V dc
Voltage range 18…32V
Input frequency N/A
Current consumption 3.1…1.6 A
Ripple 5% ac
Input power entrance Increased safety
Output connectors Terminals 10…17
Output power 4 x 8.5 W
Inset voltage range 18…32V dc
Voltage U
O
Current I
O
Co (IIC) <500 nF
Lo (IIC) <8 H
Max output cable resistance
(both directions)
Isolation path
Input power to output power
Output to output
Input power 55 W
Power dissipation 21 W
Thermal dissipation 71.67 BTU/hr
Conductors wire size
Dimensions (HxWxD) approx. 140 mm x 174 mm x 280 mm
Protections class IP 65/NEMA 7B
Weight (approx.) 7.7 kg (17 lb)
Terminals 1, 2, 4, 5
<9.5V
<1 A
<0.1
Galvanic to DIN EN 60079-11
None
4 mm2 (12 gauge) max wire rated at 100 °C (212 °F) or higher
1.2 mm (3/64 in.) insulation max
(5.51 in. x 6.9 in. x 11.0 in.)
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FLEX Ex Power Supply 13
Table 2 Environmental Specifications
Attribute Value
Operating temperature IEC 60068-2-1 (Test Ad, Operating Cold),
Storage temperature IEC 60068-2-1 (Test Ab, Unpackaged Nonoperating Cold),
Relative humidity IEC 60068-2-30 (Test Db, Unpackaged Nonoperating Damp
Shock
Vibration IEC60068-2-6 (Test Fc, Operating):
Emissions CISPR 11
Operating
Nonoperating
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
-20…70 °C (-4…158 °F)
IEC 60068-2-2 (Test Bb, Unpackaged Nonoperating Dry Heat),
-40…85 °C (-40…185 °F)
Heat):
5…95% noncondensing
IEC60068-2-27 (Test Ea, Unpackaged shock):
15 g
15 g
2 g @ 10…500 Hz
Radiated, Class A
Conducted, Class B
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14 FLEX Ex Power Supply
Table 3 Certifications
Certifications
(when
product is marked)
CE
EE
C-Tick
INMETRO
IECEx
(1)
See the Product Certification link at www.ab.com for Declarations of Conformity, Certificates, and other
certification details.
Valu e
(1)
European Union EMC Directive (2004/108/EC) , compliant
with:
EN 61000-6-4:2007; Electromagnetic Compatibility (EMC) -
Part 6-4: Generic Standard for Industrial Environments
(Class A)
EN 61000-6-2:2005; Electromagnetic Compatibility (EMC) -
Part 6-2: Generic Standard - Immunity for Industrial
Environments
EN 61326-1-4:2006 (Industrial), Electrical Equipment For
Measurement, Control, and Laboratory Use - Industrial EMC
Requirements
European Union 94/9/EC ATEX Directive, compliant with:
EN 60079-0:2006; Potentially Explosive Atmospheres,
General Requirements
EN 60079-1:2007; Potentially Explosive Atmospheres,
Protection “d”
EN 60079-7:2007; Potentially Explosive Atmospheres,
Protection “e”
EN 60079-11:2007; Potentially Explosive Atmospheres,
Protection “i”
EN 61241-1: 2004; Electrical apparatus protected by
enclosure
Australian Radiocommunications Act, compliant with:
AS/NZS CISPR11; Industrial Emissions
BR-Ex de [ib] IIC T4
Certificate number 05/UL-BRAE-0018X
Ex de[ib] IIC T4
Cert no. IECEx BVS 09.0019X
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Page 15
Ferrite Beads
Pass all IS power-supply output
wires through the ferrite bead
before connecting the cable to
the power supply.
30889
WARNING Avoid electrostatic charging.
ADVERTÊNCIA! PREVENIR CONTRA O ACÚMULO
DE CARGA ELETROSTÁTICA.
FLEX Ex Power Supply 15
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Rockwell Automation Support
Rockwell Automation provides technical information on the Web to assist you in using
its products. At http://support.rockwellautomation.com
manuals, a knowledge base of FAQs, technical and application notes, sample code and
links to software service packs, and a MySupport feature that you can customize to
make the best use of these tools.
For an additional level of technical phone support for installation, configuration, and
troubleshooting, we offer TechConnect Support programs. For more information,
contact your local distributor or Rockwell Automation representative, or visit
http://support.rockwellautomation.com
.
Installation Assistance
If you experience a problem with a hardware module within the first 24 hours of
installation, please review the information that's contained in this manual. You can also
contact a special Customer Support number for initial help in getting your module up
and running.
United States 1.440.646.3434 Monday – Friday, 8am – 5pm EST
Outside United States Please contact your local Rockwell Automation representative for
any technical support issues.
New Product Satisfaction Return
Rockwell tests all of its products to ensure that they are fully operational when shipped
from the manufacturing facility. However, if your product is not functioning, it may
need to be returned.
United States Contact your distributor. You must provide a Customer Support case
number (see phone number above to obtain one) to your distributor
in order to complete the return process.
Outside United States Please contact your local Rockwell Automation representative for
return procedure.
Allen-Bradley, Rockwell Automation, ControlLogix, RSLinx, TechConnect, and FLEX I/O are trademarks of
Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
, you can find technical
Publication 1797-5.8 - June 2010 PN -79489
Supersedes Publication 1797-5.8 - April 2006 Copyright © 2010 Rockwell Automation, Inc. All rights reserved. Pri nted in the U.S.A.
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